The overly depressing introduction, a view of the country from the perspective of somebody moving to the city, really does confuse the viewer as to what you are actually watching. Once in the city (New York from what I can tell) you are treated to some really great footage, but it still remains unclear as to what you are watching.
It's not until the seventh minute that the actual story starts; Henry Ford is introduced (and dramatised), invents his 'quadrocycle' and tests it out on the empty dark streets of the city.
From here on it's a semi-promotional vehicle (pun) for Ford, but has enough dramatised history in there to still be of interest.
While telling the story of the Model T we get to revisit the farm again, seemingly only to paint another bleak picture of country life. After that a progressive look at the evolution of the production line really makes this worth watching.
Humour wise there's a few good laughs to be had. The complex story of 'your sick mother' is overly harsh, and the footage of the sailwagon in use is particularly hilarious.
Narrated by none other than Raymond Massey, composed by Alex North, and Robert Downey Sr. is one of the credited cameramen. Full listing at IMDB; http://us.imdb.com/Details?0268138